• 접착 및 계면
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• 제9권1호
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• pp.16-21
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• 2008

이온성작용기를 갖는 수분산 폴리우레탄은 내수성이 약하기 때문에 수분에 노출된 환경에서의 사용이 제한된다. 폴리우레탄과 아크릴 고분자로 구성된 하이브리드 에멀젼을 수분산 폴리우레탄(PUD)을 emulsifier로 사용하고 아크릴 단량체들을 에멀젼 중합하여 제조하였다. 먼저 양이온성 PUD의 합성은 IPDI, PTMG1000, MDEA, AA가 사용되었고, 아크릴 단량체는 MMA와 n-BA를 사용하여 공중합하였다. PUD와 아크릴 단량체들의 중합비율에서 아크릴 단량체의 양이 증가할수록 내수성 및 인장강도가 좋아졌다. 결론적으로 단순 혼합된 에멀젼보다 하이브리드된 에멀젼이 더 우수한 물성을 나타내었다.

• 한국가시화정보학회지
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• 제20권3호
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• pp.10-18
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• 2022

We present an experimental investigation on emulsions created during the impact process between a surfactant-laden droplet and an oil layer on water. By varying the surfactant concentration and the viscosity of oil layer, we created emulsions and visualized them using multi-dimensional high-speed imaging. Our analysis shows that the emulsions are more likely to be unstable and decay within a minute if the impacting droplet contains more surfactant. We also found that there are three mechanisms of generation of emulsions depending on the concentration of surfactant and the viscosity of oil layer; the jet pinch-off, cavity pinch-off, and tearing of oil layer. Jet and cavity pinch-off turned out to be dominant mechanisms for high oil viscosities, while tearing of oil layer is dominant for low oil viscosities. Our result is potentially useful in designing optimal dispersant properties for offshore oil contamination.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2002년도 추계학술발표논문집
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• pp.209-217
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• 2002

Stability deterioration of AKD emulsion was studied with respect of the physical change of emulsion particles and the chemical change of AKD itself. Four kinds of commercial emulsions were kept at RT, 40, 50, and $60^{\circ}C$ water bath, respectively. Viscosity, particle size distribution, and solid contents of the emulsions were measured with storage time. At the same time, by performing NMR and IR spectroscopy analysis of the solvent-extracted AKD from the emulsions, the qualitative and quantitative information about the deformation of the AKD itself were obtained. AKD was gradually hydrolyzed to become dialkylketone and higher storage temperature accelerated destabilization of the AKD emulsions.

• 대한화장품학회지
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• 제30권1호
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• pp.53-58
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• 2004

본 연구에서는 에멀젼의 미세구조 분석을 위한 동결처리 전자현미경 분석의 응용에 대해 소개하였다. 동결처리 전자현미경 분극법은 에멀젼의 미세구조 분석 및 해석에 유용하며, 이러한 미세구조 해석을 통해 에멀젼의 유동 특성 발현에 대한 메카니즘의 설명이 가능할 것으로 사료된다.

• 한국막학회:학술대회논문집
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• 한국막학회 2004년도 Proceedings of the second conference of aseanian membrane society
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• pp.47-50
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• 2004

Since emulsion liquid membrane (ELM) was found by Li in the late 1960s$^{[1]}$ , a great amount of work has been conducted on the research and application of ELM$^{[2-8]}$ . Generally, during a process of ELM separation, three types of emulsions will be shown in turn. They are primary emulsion, multiple emulsion, namely ELM, and recovered emulsion respectively. Those three types of emulsions inevitably share some common properties, and at the same time, because those three types of emulsions emerge in different stages of ELM separation, some differences will be observed.(omitted)

• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
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• pp.374-386
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• 2003

Two ways of making clear emulsions\ulcornerMicroemulsion Visible light λ = 400-700 nm Microemulsion, d < 50 nmㆍRefractive Index Matching(omitted)

• 멤브레인
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• 제27권6호
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• pp.511-518
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• 2017

막유화(membrane emulsification, ME)는 SPG 막과 같이 균일한 크기의 세공을 갖는 막을 사용하여 좁은 입도분포의 에멀젼을 제조하는 기술이다. 본 연구에서는 막유화법으로 형성시킨 다중 에멀젼을 사용하여 폴리카프로락톤(PCL) 마이크로캡슐의 제조를 연구하였다. 먼저 초음파 유화기로 $W_1/O$ 단일 에멀젼을 제조한 후, premix 막유화를 적용하여 $W_1/O/W_2$ 다중 에멀젼을 형성시킨 후 용매 증발을 통해 모델 약물인 BSA가 담지된 PCL 마이크로캡슐을 제조하였다. 연속상에 대한 분산상의 비율(D/C ratio), PCL 농도, 유화제 농도, 모델 약물의 농도, 막간 압력차 등 막유화 변수가 제조된 마이크로캡슐의 입경과 입도 분포에 미치는 영향을 실험하였다. Premix-ME를 적용하여 평균 입경 $5{\sim}6{\mu}m$의 균일한 크기를 갖는 모델 약물 BSA의 함침량이 약 26%인 다중 코어형 PCL 마이크로캡슐을 제조할 수 있었다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제6권4호
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• pp.284-288
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• 2001

Lipid emulsions with saturated triacylglycerols (TAGs) with 4 to 10 carbons in each acyl chain were prepared to study how the oil component alters the stability of the lipid emul-sions when phosphatidylcholines were used as emulsifiers. The average droplet size of the emul-sions became smaller as the chain length of the TAG increased. For a given oil emulsion with smaller droplets was formed with an emulsifier having higher HLB value. The influence of HLB values on the droplet size was biggest for the tributyrin (C4) emulsion. For the tricaprylin(C8) emulsions, droplet size was identical at given emulsifier concentrations regardless of HLB values. The HLB value and the concentration of the emulsifiers also affect the droplet size of the emul-sions. The emulsions with smaller average droplet size were more stable than with bigger size for 20 days. The oil and water (o/w) interfacial tension in inversely proportional to the initial droplet size of the emulsion.

• 청정기술
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• 제23권3호
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• pp.325-330
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• 2017

This study presents the preparation of n-tetradecane-in-water emulsions with different weight ratios of n-tetradecane and water, and their potential application in packaging and shipping vaccines. The size and distribution of the n-tetradecane droplets are characterized using optical microscopy and light scattering methods, respectively. The thermal properties of the emulsions are determined using the T-history method. In the results, the emulsions, which are comprised of 17 ~ 30 wt% oil, 3 wt% surfactant, and 67 ~ 80 wt% water, are stable and have droplet sizes in the range of 100 to 800 nm. The thermal properties demonstrate that subcooling is prevented through increasing the droplet size. The results indicate that the n-tetradecane/water emulsions containing 25 ~ 35 wt% n-tetradecane, with a melting point of $2{\sim}8^{\circ}C$ and a latent heat of $227.0{\sim}250.8kJ\;kg^{-1}$, are good candidate materials for packaging and shipping vaccines.

• 생명과학회지
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• 제20권11호
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• pp.1611-1616
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• 2010

W/O/W multiple emulsion의 산화에 미치는 surfactant micelle의 영향을 규명하기 위하여 W/O/W multiple emulsion에서 continuous phase로 전이되는 ferric iron의 양과 hydroperoxide의 양을 측정한 결과, continuous phase로 전이된 ferric iron과 hydroperoxide의 양은 첨가한 과량의 surfactant micelle에 의해, 저장기간이 길어질수록 증가하였다. Ferric iron을 함유한 W/O/W multiple emulsion의 지방산화 정도는 hydroperoxide와 TBA값 및 headspace hexanal을 측정하여 살펴본 결과 과량의 surfactant에 의해 산화는 감소하였다. 이상의 결과로 첨가된 과량의 surfactant에 의해 W/O/W multiple emulsion에서 prooxidant로 작용하는 ferric iron의 위치가 변화되어 산화를 줄일 수 있을 것으로 판단하였다.